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Alphanumeric Graphic Display

Publishing Venue

IBM

Related People

Kronick, HE: AUTHOR

Abstract

A cathode ray tube display is used in a system for alphanumeric and graphic displays. A single, efficient memory format is employed. For a 64 alphanumeric character capability, eight binary coded bits are used, six bits to identify the character, one bit to distinguish between control and data words, and a parity bit for checking. A character generator decodes the six-bit BCD information and generates the stroke format required to define the selected characters. For graphic information, a series of plotting characters, each comprising two columns of four dots, are arranged and uniformly spaced side-to-side and top-to-bottom in the form of a dot matrix pattern.

Country

United States

Language

English (United States)

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Alphanumeric Graphic Display

A cathode ray tube display is used in a system for alphanumeric and graphic
displays. A single, efficient memory format is employed. For a 64 alphanumeric
character capability, eight binary coded bits are used, six bits to identify the
character, one bit to distinguish between control and data words, and a parity bit
for checking. A character generator decodes the six-bit BCD information and
generates the stroke format required to define the selected characters. For
graphic information, a series of plotting characters, each comprising two columns
of four dots, are arranged and uniformly spaced side-to-side and top-to-bottom in
the form of a dot matrix pattern.

Since the plotting character comprises eight dots, it can be identified by eight
binary bits, each bit representing an intensity signal which is either on or off. This
permits use of a mapped memory buffer in which each alphanumeric or plotting
character on the cathode ray tube has an assigned memory slot corresponding to
its position on the display. In the graphic mode, the plotting characters are
generated individually in a zig-zag sequence bottom-to-top in row 1, top-to-
bottom in row 2, etc., the characters being generated line-by-line in a typewriter
mode. Various graphic patterns can be displayed by utilizing a plurality of
plotting characters such as shown in the upper right quadrant in the drawing and
selectively unblanking the beam at specified dots. The plotting charac...